Investigation of Valve Tip End Wear Mechanism of a Four-Cylinder Automotive Engine Under High-Speed Application

Abstract This work investigates the causes of wear occurring at engine valve tip end after 400 hours operation. Fatigue was observed on product development stage engine, which is going to be used in an automotive vehicle. Valves were assembled a gasoline/CNG fuel-based four-cylinder IC engine. In this prominent during high-speed testing conditions as compared other types tests. The chemical composition worn surfaces verified by spectroscopy. microstructures, grain sizes and surface roughness determined optical microscopy tester. To evaluate mechanism, analyzed using Scanning electron microscopy. SEM analysis indicates initiation micropits subsequent propagation fatigue operating conditions. residual stresses measured subsurfaces X-ray diffraction techniques. Several investigations employing multiple techniques carried out identify root cause failure while comparing results against those untested valves. Parameters that can affect properties identified study countermeasures provided, lead successful completion with same condition.